JPS62217853A - Electromagnetic pump - Google Patents

Abstract

PURPOSE:To increase pump capacity easily to a high one by forming an annular flow path of liquid metal wound with a coil along the axial direction by coaxially providing a plurality of flow paths differing in the annular diameter. CONSTITUTION:Within a cylindrical pump casing 11, plural outside cores 13 of the same length are installed at equal spaces and outer coils 15 are wound around a plurality of axially provided slots. An outer duct 12 connected with Na inlet and outlet ports is inserted between the outside cores 13. Within the outer duct 12, an intermediate duct 16 and an inner duct 20 are secured by separators 17, 21 so that a larger annular flow path 19 and a small annular flow path 22 are formed coaxially. An intermediate core 18 is installed within the intermediate duct 16 while inner coils 23 wound around slots of an iron core 24 are arranged axially in the inner duct 20. A prescribed three-phase alternating current is applied to the outer coils 15 and inner coils 23 so that a shifting magnet field is generated between the outside core 13, intermediate core 18 and inside core 24 to make a molten Na flow in the direction of the arrow. In this manner, a pump capacity is increased easily.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a linear induction type electromagnetic pump for transporting a liquid metal such as sodium, which is an electrically good conductor. This invention relates to an electromagnetic pump that improves the number of people visiting the road.

(Prior Art) Conventionally, this type of linear induction type electromagnetic pump is constructed as shown in FIG. The inner duct 2 is housed coaxially with a predetermined gap in the radial direction, and both ducts 1
, an annular flow path 3 is formed between the two.

A coil 4 is wound around the outer periphery of the outer duct 1 along its axial direction, and the coil 4 is supported by being fitted into a groove between each comb-shaped tooth of a comb-shaped outer iron core 5.

The external iron core 5 is erected along the axial direction on the outer circumferential surface of the outer duct 1, is arranged with equal width in the circumferential direction, and its outer circumferential surface is fixed together with the outer duct 1 to a pump casing (not shown).

On the other hand, the inner duct 2 accommodates a cylindrical inner core 6 therein, and its both ends are sealed, and the outer core 5 and the inner core 6 form a magnetic circuit, and when the coil 4 is energized, the thick line arrow in the figure It forms a moving magnetic field that moves in the direction.

This moving magnetic field induces an induced current in the liquid sodium in the annular flow path 3, and the electromagnetic force generated by the intersection of this induced current and the moving magnetic field causes the sodium as a conductor to flow in the direction of the thick arrow in the figure, and the discharge port Discharge from 1b.

(Problems to be Solved by the Invention) In order to increase the pump capacity of such a conventional electromagnetic pump, the diameters of both the outer duct 1 and the inner duct 2 are enlarged to increase the diameter of the annular flow path 3. In addition to expanding the cross-sectional area, the coil 4
By increasing the number of turns of the pump, the pump discharge output was increased.

For this reason, conventional electromagnetic pumps have the problem of becoming larger and heavier.

Therefore, an object of the present invention is to provide a small-sized, large-capacity electromagnetic pump.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a plurality of annular channels with different diameters for flowing liquid metal (), and these annular channels are provided in, for example, a double annular shape. In an electromagnetic pump that winds a coil along the axial direction of a flowing annular flow path to form a moving magnetic field that moves along the flow direction of the liquid metal, the annular flow path has a plurality of different ring diameters, These annular channels are provided coaxially.

(Operation) When the coil is energized, a moving magnetic field is formed in each of the liquid metals in the plurality of annular channels along the flow direction thereof.

For this reason, an induced current is induced in the liquid metal in each annular flow path, and this induced current interlinks with the moving magnetic flux, causing ff1ra
This electromagnetic force acts on the liquid metal as a pump driving force, causing the liquid metal in each annular channel to flow together and be discharged.

Therefore, since the liquid metal flows together in the plurality of annular channels, it is possible to increase the pump capacity, and only 6
For example, since the small annular flow path is coaxially accommodated within the large annular flow path, the pump can be made smaller.

(Example) Examples of the present invention will be described below with reference to FIGS. 1 to 4.

1 to 3 show an embodiment of the present invention, in which a cylindrical outer duct 12 with a smaller diameter is provided coaxially within a cylindrical pump casing 11, and one end of the outer duct 12 is The suction port 12a is connected to a liquid metal sodium source (not shown), and the other end thereof is opened to a discharge port 12b.

Inside the pump casing 11, a plurality of comb-shaped external iron cores 13 are fixed with fittings 14 so that their longitudinal directions coincide with the axial direction, and are arranged at equal pitches in the circumferential direction.

The grooves between the comb-shaped teeth of these comb-shaped external iron cores 13 open on the outer periphery of the outer duct 12, and the outer coil 15 is fitted into these grooves. , is wound along its axial direction, and the suction port 12 of the outer duct 12
A moving magnetic field is formed that moves from a to the discharge port 12b.

A cylindrical intermediate duct 16 having a smaller diameter is coaxially accommodated within the outer duct 12 and fixed by an outer support 17, and the wall of the intermediate duct 16 is filled with an intermediate iron core 18. As shown in FIG. 2, an annular space defined by the outer peripheral surface of the intermediate duct 16 and the inner peripheral surface of the outer duct 12 is formed into a large annular flow path 19 through which liquid sodium flows.

Further, a cylindrical inner duct 20 having a smaller diameter is coaxially accommodated within the intermediate duct 16 and supported by an inner support 21 . An annular space defined by the inner peripheral surface of the intermediate duct 16 and the outer peripheral surface of the inner duct 20 is formed into a small annular flow path 22 through which liquid sodium flows.

The inner duct 20 has both ends liquid-tightly spaced, and is formed into a streamlined shape that tapers outward, and has an inner core in which an inner coil 23 is wound around the outer periphery along the axial direction. 2
4 is filled.

One end of the power supply line 25 that is connected to the inner coil 23 and feeds three-phase AC power is connected to an inner duct 20, an inner support 21, as shown in FIG. 3, which is an enlarged view of part A in FIG. The cable extends into the pump casing 11 by passing through each cable hole 26 of the intermediate duct 16, the intermediate iron core 18, the outer support 17, and the outer duct 12 in the radial direction, and is connected to a power source via a voltage control device (not shown). has been done.

Further, like the inner and outer coils 15 and 23, the power supply line 25 is coated with ceramics having highly reliable insulating properties even at high temperatures.

Next, the operation of this embodiment will be explained.

When the outer coil 15 and the inner coil 23 are energized with a predetermined three-phase alternating current, a magnetic circuit is formed between the outer core 13 and the intermediate core 18 and between the inner core 24 and the intermediate core 18, and The vehicle annular channel 19.22 has a flow direction of liquid sodium, i.e. an inlet 12 of the outer duct 12.
A moving magnetic field is formed that moves from a to the discharge port 12b.

Because of these moving magnetic fields, large, vehicle annular channels 19.22
Induction into liquid sodium inside? 1 fF is induced respectively, and an electromagnetic force is generated in the liquid sodium by the intersection of these induced currents and each moving magnetic flux, and this electromagnetic horn acts on the liquid sodium as a pump driving force, and the large vehicle annular flow path 19
．． The liquid sodium in 22 flows into the suction port 12 of the outer duct 12.
a to the discharge port 12b, and the discharge port 12b
More is discharged.

In this way, the liquid sodium is large, the vehicle annular flow path 19.2
2, the pump capacity can be increased.

Moreover, since the small annular flow path 22 is coaxially accommodated within the large annular flow path 19, the pump can be made smaller.

FIG. 4 shows a longitudinal section of another embodiment of the present invention, in which the above-mentioned embodiment has a large annular flow path 19 and a small annular flow path 22 arranged in parallel, and the movement that occurs in both flow paths 19 and 22 is While the moving directions of the magnetic fields are made equal, in this embodiment, the large annular flow path 30
are connected in series to the small annular flow path 31 to form both flow paths 30 and 31.
The main difference is that the moving directions of the moving magnetic fields are opposite to each other, so that the flow direction of the liquid sodium is reversed.

That is, this embodiment is constructed as shown in FIG. 4, in which a cylindrical outer duct 33 having a liquid sodium suction port 33a is coaxially accommodated in a cylindrical pump casing 32, and the outer duct 33 An intermediate duct 34 having a discharge port 34a for liquid sodium is coaxially accommodated therein, and a large annular flow path 30 defined by the outer circumferential surface of the intermediate duct 34 and the inner circumferential surface of the outer duct 33. is formed.

Inside the pump casing 32, a plurality of external iron cores 36 are arranged such that an outer coil 35 is wound in the axial direction around the outer duct 33.
are fixed by supporting metal fittings 37 at approximately equal pitches in the circumferential direction.

The intermediate duct 34 connects its inner end to the inner end of the outer duct 33.
The intermediate duct 34 has an outer intermediate core 38 on its outer diameter and an inner intermediate core 39 on its inner diameter inside the tube wall of the intermediate duct 34. It has an iron core storage section in which the iron cores are magnetically sealed and filled with each other by a magnetic shield 40.

The magnetic shield 40 may be made of a partition plate made of a high-permittivity material such as permalloy and coated with a ceramic coating for electrical insulation, or may be a simple air gap.

An inner duct 41 having a smaller diameter is housed coaxially with a predetermined gap in the radial direction on the inner periphery of the iron core housing portion of the intermediate duct 34, and the outer periphery of the inner duct 41 and the inner periphery of the intermediate duct 34 A small annular flow path 31 is formed. The right end portion of the small annular flow path 31 (see FIG. 4) communicates with the large annular flow path 30 at the fold 1W33b.

The inner duct 41 is filled with an inner core 43 having an inner coil 42 wound around the outer periphery along the axial direction. inner coil 4
A power supply line 44 that is connected to the inner duct 2 and supplies three-phase AC power extends outside from a fixed portion of the outer duct 33 that fixes one end of the inner duct 41.

Three-phase AC power is applied to the outer coil 35 and the inner coil 42, respectively, so that the moving directions of the moving magnetic fields generated in the large annular flow path 30 and the small annular flow path 31 are opposite directions.

As a result, the magnetic circuit formed by the outer iron core 36 and the outer intermediate iron core 36 forms a moving magnetic field that moves the liquid sodium in the large annular flow path 30 in the direction shown by the arrow in the figure, and guides the liquid sodium. induces a current. This induced current interlinks with the magnetic flux of the moving magnetic field, and the electromagnetic force acts on the liquid sodium as a pump driving force, causing the liquid sodium to flow in the direction of the arrow in the figure, turning the right end of the large annular channel 30. It flows into the section 33b, where it is reversed and flows into the small annular channel 31.

On the other hand, in the small annular flow path 31, a moving magnetic field in the opposite direction to the moving magnetic field of the large annular flow path 30 is formed by the magnetic circuit formed by the inner iron core 43 and the inner intermediate iron core 36.
The liquid sodium that has flowed into one end of the small annular flow path 31 further flows toward the outlet 34a of the intermediate duct 34,
It is discharged from the discharge port 34a.

In FIG. 4, reference numeral 45 is an outer support that supports the intermediate duct 34 within the outer duct 33, and reference numeral 46 is an inner support that supports the inner duct 41 within the intermediate duct 34.

As described above, in this embodiment, since a pump driving force of 1 force is applied to the liquid sodium in the large and light rain annular flow paths 30 and 31, the pump discharge force can be increased. .31 are connected at the folded portion 33b to form a double ring shape, so the entire pump can be miniaturized.

Note that in each of the above embodiments, the annular flow path is the large annular flow path 19.
30 and the small annular flow path 22, 31 have been described, the annular flow path may be configured to have a triple or more ring shape.

〔Effect of the invention〕

As explained above, in the present invention, a plurality of annular channels through which liquid metal flows are provided with different ring diameters, and these annular channels are provided coaxially.

Therefore, according to the present invention, since liquid metal can be transported together through a plurality of annular channels, it is possible to increase the capacity of the pump.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of the -≠embodiment of the M11 pump according to the present invention, and FIG. 3 is an enlarged view of part A in FIG. 1, FIG. 4 is a vertical sectional view of another embodiment of the present invention, and FIG. 5 is a partially cutaway perspective view of a conventional 'Fi magnetic pump. It is a diagram. 11.32...Pump casing, 12.33...
Outer duct, 12a, 33a... Suction port, 12b. 34a...Discharge port, 13.36...External iron core, 15
゜35...outer coil, 16.34...middle duct,
18... Intermediate iron core, 19.30... Large annular channel, 2
0...Inner duct, 22.31...Small annular flow path, 23
...Inner coil. Representative patent attorney Nori Chika Yudo Hirofumi Mimata Figure 2

Claims (1)

[Claims] 1. An electromagnetic pump in which a coil is wound along the axial direction of an annular channel through which liquid metal flows to form a moving magnetic field that moves along the flow direction of the liquid metal, wherein the annular channel is An electromagnetic pump characterized in that it has a plurality of annular flow paths having different annular diameters, and these annular flow paths are provided coaxially. 2. The electromagnetic pump according to claim 1, wherein the liquid metal is liquid sodium.